The Wii Balance Board is a character in the Wii Fit series. He is an animated, talking version of the Balance Board used with the game.
Wii Fit/Wii Fit U
In the Wii Fit Series, the balance board helps the player keep track of their weight loss. He appears on the main menu of the game, and runs the Body Test. He gives the players gifts like the Fitness Piggy and New Stamps for the Body Test Calendar.
Super Smash Bros. For Wii U
In the new Super Smash Bros for Wii U, the Wii Balance Board appears in the background of the Training Room Stage, and appears briefly during Wii Fit Trainer's "enter battle" animation at the start of fights.